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Deleted 03.spherical-refracting-surface/01.spherical-refracting-surface-main/textbook.en.md, 03.spherical-refracting-surface/01.spherical-refracting-surface-main/textbook.es.md, 03.spherical-refracting-surface/01.spherical-refracting-surface-main/textbook.fr.md, 03.spherical-refracting-surface/02.spherical-refracting-surface-overview/cheatsheet.en.md, 03.spherical-refracting-surface/02.spherical-refracting-surface-overview/cheatsheet.es.md, 03.spherical-refracting-surface/02.spherical-refracting-surface-overview/cheatsheet.fr.md, 03.spherical-refracting-surface/02.spherical-refracting-surface-overview/dioptre1ok.png, 03.spherical-refracting-surface/02.spherical-refracting-surface-overview/dioptre2ok.png, 03.spherical-refracting-surface/02.spherical-refracting-surface-overview/dioptre3ok.png, 03.spherical-refracting-surface/02.spherical-refracting-surface-overview/dioptre4ok.png, 03.spherical-refracting-surface/03.spherical-refracting-surface-beyond/annex.en.md, 03.spherical-refracting-surface/03.spherical-refracting-surface-beyond/annex.es.md, 03.spherical-refracting-surface/03.spherical-refracting-surface-beyond/annex.fr.md, 03.spherical-refracting-surface/04.spherical-refracting-surface-parallel-1/default.en.md, 03.spherical-refracting-surface/04.spherical-refracting-surface-parallel-1/default.es.md, 03.spherical-refracting-surface/04.spherical-refracting-surface-parallel-1/default.fr.md, 03.spherical-refracting-surface/05.spherical-refracting-surface-parallel-2/form.en.md, 03.spherical-refracting-surface/05.spherical-refracting-surface-parallel-2/form.es.md, 03.spherical-refracting-surface/05.spherical-refracting-surface-parallel-2/form.fr.md, 03.spherical-refracting-surface/06.spherical-refracting-surface-level-down/page.en.md, 03.spherical-refracting-surface/06.spherical-refracting-surface-level-down/page.es.md, 03.spherical-refracting-surface/06.spherical-refracting-surface-level-down/page.fr.md, 03.spherical-refracting-surface/07.spherical-refracting-surface-level-up/portal.en.md, 03.spherical-refracting-surface/07.spherical-refracting-surface-level-up/portal.es.md, 03.spherical-refracting-surface/07.spherical-refracting-surface-level-up/portal.fr.md, 03.spherical-refracting-surface/topic.en.md, 03.spherical-refracting-surface/topic.es.md, 03.spherical-refracting-surface/topic.fr.md files